I found two churches with William Morris windows on the Stage One Tour de France route. I watched the riders come through Otley this morning, then went to visit the churches. The first one, St. Wilfrid in Pool in Wharfedale, was decorated with bicycles and had a "Le church, le tour, le welcome !" sign but was locked.
The second, St. Margaret's in Ilkley, is a Norman Shaw church. There are lots of good windows inside, including one of four angels (below) designed by WM and made in 1894. It looks great and in composition is so much simpler than the rest of the windows (mostly made by Powell & Sons) in the church.